MYNetwork is a set of Objective-C networking classes for Cocoa applications on Mac OS X or iPhone, including an implementation of the BLIP protocol, a generic TCP client/server implementation, and networking utility classes.

ASIHTTPRequest is an easy to use wrapper around the CFNetwork API that makes some of the more tedious aspects of communicating with web servers easier. It is suitable to performing basic HTTP requests and interacting with REST-based services (GET / POST / PUT / DELETE). The included ASIFormDataRequest subclass makes it easy to submit POST data and files using multipart/form-data.

A class that helps integrate Twitter support into your application via the Twitter API. Provides access to the full Twitter API through the use of standard Cocoa objects like NSDate and NSString. Includes xAuth for managing authentication inside the app. Works on OS X and iOS.